ECE :: Communication Systems
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Some advantages of optical fibre cables are
- small diameter
- Immunity to cross talk and EM interference
- Laser and LED modulation methods lend themselves ideally to digital operation
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The contrast control in colour TV receiver is done by
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The requirements of carrier frequency are
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If N bits are lumped together to get an N-bit symbol, the possible number of symbols is
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The received signal frequency at any time of a super-heterodyne receiver having IF = 456 kHz is 1 MHz. The corresponding image signal is
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Assertion (A): Electromagnetic waves in free space spread uniformly in all directions from a point source
Reason (R): Free space has no interference or obstacles.
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In the FM wave described by equation v = 15 sin (4 x 108 t + 3 sin 1100 t), the maximum frequency deviation is
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The radar cross-section of a target depends an
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1 MHz - 912 kHz 
. 
[sin (
.